/*
 * Copyright 2011 Clean GWT
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */
package com.cleangwt.web.shared;

import java.util.List;

import com.cleangwt.json.client.CollectionDeserializer;
import com.cleangwt.json.client.JsonValueDeserializer;
import com.cleangwt.json.client.NumberDeserializer;
import com.cleangwt.json.client.SimpleObject;
import com.cleangwt.json.client.SimpleObjectDeserializer;
import com.google.gwt.json.client.JSONObject;
import com.google.gwt.json.client.JSONValue;

/**
 * The {@link PagedResult} json deserializer.
 * 
 * @author Jess
 * @version 1.0
 * @since 1.0
 */
public class PagedResultDeserializer extends JsonValueDeserializer<PagedResult> {

  private static PagedResultDeserializer impl;

  /**
   * @return the instance of {@link PagedResult} deserializer
   */
  public static PagedResultDeserializer get() {
    if (impl == null) {
      impl = new PagedResultDeserializer();
    }
    return impl;
  }

  private PagedResultDeserializer() {
  }

  @Override
  public PagedResult fromJson(JSONValue jsonValue) {
    JSONObject jsonObject = (JSONObject) jsonValue;
    List<SimpleObject> pageList =
        (List<SimpleObject>) CollectionDeserializer.get(SimpleObjectDeserializer.get()).fromJson(
            jsonObject.get("pageList"));
    Number availableCount = NumberDeserializer.get().fromJson(jsonObject.get("availableCount"));
    return new PagedResult(pageList, availableCount.longValue());

  }
}
